Thy sons have fainted. Note the Alternation in this verse. Thus: "fainted at the head", &c, and "they lie as. wild bull", &c.
Related Commentaries of Isaiah 51:20
Isaiah 51:20
20 Thy sons have fainted, they lie at the head of all the streets, as a wild bull in a net: they are full of the fury of the LORD, the rebuke of thy God.